4(2-(alpha-methyl-phenethylamino)-ethoxy)-benzenes

ABSTRACT

This invention relates to phenoxyalkylamines having the formula:   IN WHICH R1 is hydrogen, halogen, an alkyl or an alkoxy group, A is an alkyl, alkylaryl, cycloalkyl, alkenyl, cycloalkenyl group or a group   IN WHICH R2 is an alkyl or alcoxy alkyl group, and R3 is an alkyl, cycloalkyl or aryl group, and their acid addition salts. Said phenoxyalkylamines possess coronary vasodilatator and cardiotonic properties.

Unite States Patent 1191 v Pinhas Oct. 22, 1974 4[2-(a-METHYL-PHENETHYLAMINO)- Primary Examiner-Robert V. Hines ETHOXY1-BENZENES Attorney, Agent, or Firm-Oldham -& Oldham C0. [75] Inventor: Henri Pinhas, Paris, France [57] ABSTRACT Assigneei Laboraioires Lamche Navarro, This invention relates to phenoxyalkylamines having Levallo1s, France the f l n H [22] Filed: Dec. 21, 1971 211 App]. N6; 210,560

' OCHiCHr-NH HCH; [30] Foreign Application Priority Data M 7 Dec. 28, 1970 France 70.46877 in which R] is y g g an alkyl or an 521' 11s. 01.... 260/570.7, 260/501.18, 260/501.19, 2 1 5231 5; 1 lg cyclmlkyh alkeny" 260/570 R, 260/570.6, 260/591, 269 612 1), IL) '3 PM 5.2.2.. 1 424/316, 424/330 OH on [51] Int. Cl. C07c 93/06 [58] Field of Search 260/570], 501.18, 501.19 a

in vvhich R is an alkyl or alcoxy alkyl group, and R is [56] References Cited an alkyl, cycloalkyl or aryl group, and their acid addi- UNITED STATES PATENTS tion Sam a??? at ii Said phenoxyalkylnmines possess coronary 3:542:792 11/1970 sawing 6 :III;I:.......III 260/570I7 X Vasodllatator and cardlmonc Properties 3 Claims, No Drawings from hydrogenation of the ketone 1 4[2-(a-METHYL-PHENETHYLAMINO)-ETHOXY]- BENZENES COR NEE-L 4 in which n is zero or 1, R is hydrogen or a hydroxy group, R is an alkyl group and R is hydrogen, a hydroxy group or an alkyl group, R being other than hydroxy when n is equal to zero, or a product resulting group COR, thereof to an alcohol group CHOHR,.

The vasodilatator and spasmolytic properties of said prior phenoxyalkylamines were found to be quite outstanding.

However, there have now been found new phenoxyalkylamines which, while having still better vasodilatator and spasmolytic properties than those although already exceptional of the prior phenoxyalkylamines, have a better therapeutic ratio than the latter. Phenoxyalkylamines were prepared which exhibit toxicity only at dosages above 500 mg and sometimes up to 1,500 mg under the same experimental conditions as those mentioned above.

Said new phenoxyalkylamines according to the invention have the formula:

in which R is an alkyl or alkoxyalkyl group, and R is an alkyl, cycloalkyl or aryl group.

In the above definition, the alkyl and alkenyl radicals are advantageously lower radicals, having typically from one to 12 carbon atoms and preferably from one to six carbon atoms.

When R is an aryl group, it is advantageously a phenyl group, whilethe cyclohexyl ring is the preferred cycloalkyl ring for A. In the case where A is cycloalkenyl, it is frequently found that the double bond in the ring may migrate to a juxtanuclear position.

The phenoxyalkylamines of this invention may also exist in the form of acid addition salts thereof with inorganic or organic acids and typically as the hydrohalides, particularly the hydrochlorides and hydrobromides, as the nitrates, sulfates, methanesulfonates, lactates, citrates, maleates, tartrates, acetylsalicylates, acetates, oxalates, and the like salts which are readily pre- 2 pared by reacting compounds (I) as thefree base with stoichiometrically equivalent amounts of the selected acid or acids.

Formula (I) always includes at least one asymmetrical carbon atom. It is understood that the invention includes within its scope the optically active and racemicforms of the phenoxyalkylamines having the formula To prepare said phenoxyalkylamines, a-methylphenethylamine having the formula:

I HEN-"c n-om-Q may be condensed with a phenoxy intermediate having the formula:

in which A represents a group A or an A-genic group, X is halogen, for example bromine, R, and A having the above-defined meanings and, when A is an A-genic group, it is converted to a group A.

The term A-genic group denotes any group capable of giving rise to a groupA. I

The phenoxyalkylamines of the prior art are exemplary of'condensations products carrying an Agenic group. I

Their alcohol groups CHOHR thus, of CHOHR type, may be etherified, for example by heating in alcohol medium (R OH) in the presence of hydrochloric acid, to give phenoxyalkylaminesaccording to the in vention, in which A is with a-methyl-phenethylamine, to give the phenoxyalk-' I ylamines according to the invention, without'any subsequent synthesis step. i

This condensationmay be carried out under refluxing conditions, within an alcohol solvent, such as ethanol, in the presence of triethylamine or other basic agents which bind thehydrohalic acid formed. Intermediate compounds (lll) are obtained by reacting a phenol compound of the formula: A1

V with a di-halogenated compound:

Y being halogen' and the other symbols having the aforementioned meanings.

EXAMPLE 1 l-Propyl-4-[ 2-( a-methyl-phenethylamino )-ethoxy]- benzene A -C H R H Procedure 1 4-(2-bromo-ethoxy)-l-propyl-benzene (Ill):A -C H R H; X Br) is first prepared. p.l-lydroxypropylbenzene (0.25 mole) is dissolved in water (350 ml) containing sodium hydroxide (0.25 mole). 1,2- Dibromo-ethane (0.3 mole) is addedthereto. After refluxing and stirring during 20 hours, the reaction mixture is allowed to cool. It is extracted with diethyl ether, washed with dilute sodium hydroxide and then with water. The ether phase is dried, concentrated, and the residue is then distilled: b.p., 1 -1 l7C (boiling point under a pressure of 1 mm Hg). The bromo derivative obtained above (0.2 mole), a-methyl-phenethylamine (0.2 mole) and triethylamine (0.6 mole) dissolved in ethanol (400 ml) and then refluxed during 48 hours. The alcohol solvent is removed in vacuo. The residue is dissolved in an organic solvent, such as diethyl ether or ethyl acetate. Hydrochloric acid (ca. 10 percent solution) is then added to the well stirred solution. The resulting crystals are suction filtered. l-Propyl-4-[2-(amethyl phenethylamino)-ethoxy]-benzene hydrochloride is then recrystallized from ethanol (Yield 73 M.p. l7ll73C.

Procedure 2 Zinc amalgam (H) g), 60 hydrochloric acid (60 ml) and 4-[2-(a-methyl-phenethylamino)-ethoxy]- propiophenone hydrochloridev (3 g) (described in French B.S.M. .M-7255) are vigorously stirred and heated to refluxing. Concentrated hydrochloric acid (5 ml) is added at 2 hour intervals, during 12 hours. Generally, in the hot, the reaction medium becomes a homogeneous solution. In the cold, l-propyl-4-[2-(ozmethyl-phenethylamino)-ethoxy]-benzene hydrochloride precipitates out in the form of crystals which are recrystallized from ethanol.

EXAMPLE 2 l-Heptyl-4-[ 2-( a-methyl-phenethylamino )-ethoxy]- benzene. A CH3(CH2)B; R1 H Procedure 1 4-(2-bromo-ethoxy)-l-heptyl-benzene is prepared under the conditions described in Example 1 from par a-hydroxy-l -heptyl-,benze ne, b.p.,= ll25C..

This bromo derivative is condensed with a-methylphenethylamine under the same conditions as in Example l.

l-Heptyl-3-[2-(a-methyl-phenethylamino)-ethoxy]- benzene hydrochloride is then obtained. M.p. 177-179C.

Procedure 2 4-[2-(a-methyl-phenethylamino)-ethoxy]- heptanophenone hydrochloride (3 g) (R, -(CH CH R, H), prepared as described in French B.S.M. M-7255 (M.p. l86l89C), is reduced by reaction according to Clemmensen under the conditions described in Example 1. This gives l-he ptyl- 4-[2-(a-methyl-phenethylamino)-ethoxy]-benzene (hydrochloride. M.p. l77l79C.

EXAMPLE 3 l-Propyl-3-methyl-4-[ 2-( a-methyl-phenethylamino ethoxy]-benzene. A 2)2 s; 1

The hydrochloride of this product, prepared according to either of the procedure described in Example 1, melts at l65l68 C.

EXAMPLE 4 1-[ l-ethoxy-propyl] -4-[ 2-( oz-methyl-phenethylamino ethoxy]-benzene.

-- J LL EXAMPLE 6 Substituting l-hydroxy-2-methoxy-ethane for ethanol, l-[- l B-methoxy-ethoxy)-propyl]-4-[2-(amethyl-phenethylamino)-ethoxy]-benzene hydrochloride is obtained, under the same conditions, instead of the derivative of Example 4.

methyl-phenethylamino)-ethoxy]-benzene hydrochloride:

atron-001m";

R cyclohexyl; R C H R H is obtained in ethanol solution containing hydrochloric acid under the conditions described in Example 4 from l-[(1-cyclohexyl-1-hydroxy)-methyl]-4-[2-(a-methylphenethylamino)-ethoxy]-benzene described in French Pat. No. PV 70 46 875 filed by Applicant. it melts at 160-16 2C.

EXAMPLE 8 Substituting l-hydroxy-2-methoxy-ethane for ethanol, 1-[( 1 -cyclohexyl-1-fl-methoxyethoxy)-methyl]-4- [2-(oz-methyl-phenethylamino)-ethoxy]-benzene hydrochloride is obtained under the same conditions described in Example 7.

EXAMPLE 9 l '-[a-ethoxy-benzyl]-4'-[2-(a-methylphenethylamino)-ethoxy]-benzene:

is obtained in ethanol solution containing hydrochloric acid, under the conditions described in Example '4, from l{oi-hydroxy-benzyl1-4-[2-(oz-methylphenethylamino)-ethoxyl-benzene described in French Pat No. PV 70 46 875 by Applicant. It melts at l56-158C.

EXAMPLE l0 1-[ a-( B-methoxyethoxy)-benzyl]-4-[ 2-( oz-methylphenethylamino)-ethoxy]-benzene hydrochloride melts at l24-126C and is obtained by a process similar to that described in Example 9.

3 p nyl; R2 ta-$766143; R. H EXAMPLE 1| The product, b.p., -122C is obtained after refluxing during 24 hours and the usual treatment.

The bromo derivative (0.05 mole), a-methy1- phenethylamine (0.05 mole) and triethylamine (0.15 mole) in ethanol are then refluxed during 48 hours. Treatment as in Example 1 gives the hydrochloride, which melts at about l45-l48C.

Procedure 2 I l-[( l-hydroxy-propyl)]-4-[2a(o:-methylphenethylamino)-ethoxy]-benzene (ca. 0.01 mole) (described in French B.S.M. M-7255) is refluxed during about 10 hours, in the presence of potassium hydrogen sulfate (0.1 mole) in water (ca. 100 ml).

The same hydrochloride, melting at about 148C, is obtained after conventional treatment.

EXAMPLE 12 1-[( l-cyclohexyl)-methyl]-4-[2-(a-methyl- I phenethylamino)-ethoxy]-benzene hydrochloride or 1- cyclohexylidene-methyl -4-[ 2-( a-methylphenethylamino)-ethoxy]-benzene hydrochloride is prepared, using the procedure described in Example 1.

I The double bond of the cyclohexenyl may migrate in the side-chain, and an equilibrium is found to become established between both said isomeric forms.

The product melts at 152-l56C.

EXAMPLE l3 Z-Methoxyl -butyl-4- 2-( a-methylphenethylamino')-ethoxy]-benzene hydrochloride, prepared according to the procedures described in above Example 11, melts at l66169C. A "T: '-C4H9; R! I EXAMPLE 14 3 '-Methyl-1 l-cyclohexenyl)-methyl1-4-[2-(amethyl-phenethylamino)-ethoxy]-benzene hydrochloride, which melts at l60l63C; is prepared using the procedure of Example 1.

EXAMPLE l5 l-[benzyl]-4-[ 2-(d-methyLphenethylamino)- ethoxyl-benzene hydrochloride dure of Example 1.

EXAMPLE 16 l-[cyclohexyl-methyl]-4-[2-(a-methyl- V phenethylamino)-ethoxy]-benzene hydrochloride.

is prepared using the procedure of Example 1. It melts 10 at about l84 l 87C.

I EXAMPLE l7 3-Chloro-[( l-cyclohexyll -ethoxy)-methy11-4-[2-(ozmethyl-phenethylamino)-ethoxy]-benzene hydrochloride is prepared using the procedure of Example 1.

R cyclohexyl; R QH R 01 This product melts at about l65l70C.

EXAMPLE 18 l l-ethoxy-butyl]-4-[2-( a-methyl-phenethylamino)- ethoxy]-benz'ene isrprepared using the procedure of Example 1.

The hydrochloride of this compound melts at l62l65C.

EXAMPLE 19 phenethylamino)-ethoxy]-benzene This product is prepared according to the technique described in Example .4. The hydrochloride melts at 164-l65C.

The results of toxicological and pharmacological tests demonstrating the safe character and the activity of the phenoxyalkylamines of this invention are given below.

l; ACUTE TOXICITY The acute toxicities of said materials were investi- 5 gated orally, in Swiss mice and Sprague Dawley rats.

The animals are fasted 18 hours prior to the single administration of the product and are kept under supervision 14 days during which their behavior and death rate were noted.

The LD of said products, investigated in both species and calculated according to the method according to Litchfield and Wilcoxon are of the order of from 500. to 1,500 mg/kg.

ll. CORONARY DILATATOR ACTION 1. On the isolated heart Langendorffs method The tests were carried out on the hearts of Fauve de Bourgogne (about 2 kg) rabbits. The hearts are rapidly taken out and maintained in surviving condition by perfusion of a physiological (Tyrode type) liquid heated at 37C and oxygenated under a constant pressure of 50-60 cm of water. Perfusion of the hearts was effected counter-currently, and volumetric determinations of the coronary rate of flow were recorded at 30 second intervals.

After stabilization of the basic rate of flow, the products, dissolved in physiological saline solution, are injected in a volume of from 0.05 to 0.2 ml.

Dose-action curves were established from the various results obtained.

The products produce a marked increase of the coronary rate of flow which is apparent at a dosage of 10y; a 50 percent increase of the original rate of flow is obtained, depending on the test products, at a dosage comprised within the range from 15' to 1007.

2. On the whole animal The tests were carried out in male and female dogs having a weight between 10 and l5 kg.

After chloralose-induced anesthesia, the animals are placed under artificial respiration. I

The carotidp'ressure is recorded, together with the cardiac frequency and the electrocardiogram.

The coronary flux is investigated by means of a nycotron.

The test materials were dissolved in physiological saline solution and administrated by the intravenous route.

Increase of the coronary flux is observedat dosages from 0.5 to 2 mg/kg.

lll. ACTION ON CONTRACTILE STRENGTH The tests were carried out either in the whole animal, or in the isolated heart.

Dogs, both male and female, are anesthetized with chloralose.

Systemic blood pressure is recorded at the level of The products were tested on the isolated heart of rabbit maintained in surviving condition by Langendorffs method. Cardiac stimulation is apparent at dosages of about 2003'.

IV. SPASMOLYTIC ACTION The spasmolytic action was studied in vitro with a fragment of duodenum of rat maintained in surviving condition in an oxygenated physiological liquid. lnhibition of 50 percent 'of the contraction due to effusion of a given dose of acetylcholine and barium was studied. The ED of the test products is comprised within a range from 20 to 657' with respect to acetylcholine induced contraction, and within a range from to 80y with respect to barium-induced contraction.

It is apparent from such tests that the phenoxyalkylamines of this invention and their non-toxic salts are useful in human therapeutics for the curative or preventive treatment of heart conditions, as coronary vasodilatator, cardiotonic and spasmolytic drug.

in such applications, the therapeutic composition is advantageously administered orally, at a dosage of from 150 to 750 mg of active ingredient per 24 hours.

Any formulations suitable for this route of administration may be used, the active ingredient being admixed with a pharmaceutically acceptable carrier on excipient.

An example of such a formulation is given:

Tablets containing each 50 mg (average dose) I00 mg (strong dose) Talc Lactose Mg stcarate, q.s. to make I tahlcl.

Excipicnts 

1. 1-(1-ETHOXY-PROPYL)-4-(2-(A-METHYL-PHENETHYLAMINO)BENZENE.
 2. 1-Butenyl-4-(2-( Alpha -methyl-phenethylamino)-ethoxy)-benzene.
 3. 1-(1-ethoxy-butyl)-4-(2-( Alpha -methyl-phenethylamino)-ethoxy)-benzene. 